my 305 tbi.......hey, i noticed my "service engine soon" light pop on today. so i tested the ecm, and i got code 43, the pamphlet i got from autozone does not have the definition of code 43 in the book. does anybody have the definition of this code? let me know. thanks.



Dozer80464@aol.com

 

Here check out this link. It gives most of the codes and you can find out about each of them if you click on them.

http://www.gmtips.com/3rd-degree/dox...es/code-01.htm

Also, you can go to the very bottom of this page:

https://www.thirdgen.org/newdesign/faq/thirdgen.shtml

hope that this helps.

 

it says Electronic Spark Timing (EST) Circuit - low voltage detected what the hell is that??

 

it says >>>Code 43 ~ Check ECM wiring. Replace knock sensor.
how do i do that?

 

Good question man. I never looked at what it said for code 43. You might want to check simple things like all of the connections to the ECM and connections at the TPS sensor. Possibly disconnecting the TPS sensor and cleaning the contacts with some contact cleaner might do it. I'm not sure what the knock sensor is; i would ask one of the tech heads on this site.

 

wheres the tps sensor located? how do i get in contact with one of the "tech heads"? and on the ecm, where are the connections located??

oh yeah, i forgot that i have a racing chip in the computer, will this cause any problems? ive had it in there for a long time, it never cause any problems.

 

check this picture out, it shows where the TPS sensor is on the TPI engines. I am not sure if it's in the same spot on the TBI's or not.

http://www.gmtips.com/3rd-degree/dox...o-id/tb/tb.htm

since i don't know where the exact connections are at the ECM, just make sure all of the connections that go to the ECM are firmly connected and they are just hangin there or are loose.

The member on this page that may know goes by the name of Danno. You also might want to try Bernard Tripp (aka GMTech on the ThirdGen.Org Message Board). He is an ASE Certified Master Technician with Advanced Level Engine Performance. He works at a Buick-GMC dealer and is a long time F-body Fan.
He is about the smartest guy on this site when it comes to engine diagnostics. I would give him a try at:

bctripp@gateway.net